Manpage of KILLPG
KILLPGSection: Linux Programmer's Manual (2)
NAMEkillpg - send signal to a process group
int killpg(int pgrp, int sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
- _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE
DESCRIPTIONkillpg() sends the signal sigto the process group pgrp. See signal(7) for a list of signals.
If pgrpis 0, killpg() sends the signal to the calling process's process group. (POSIX says: If pgrpis less than or equal to 1, the behavior is undefined.)
For a process to have permission to send a signal it must either be privileged (under Linux: have the CAP_KILLcapability), or the real or effective user ID of the sending process must equal the real or saved set-user-ID of the target process. In the case of SIGCONTit suffices when the sending and receiving processes belong to the same session.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errnois set appropriately.
- sigis not a valid signal number.
- The process does not have permission to send the signal to any of the target processes.
- No process can be found in the process group specified by pgrp.
- The process group was given as 0 but the sending process does not have a process group.
CONFORMING TOPOSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (killpg() first appeared in 4BSD).
NOTESThere are various differences between the permission checking in BSD-type systems and System V-type systems. See the POSIX rationale for kill(). A difference not mentioned by POSIX concerns the return value EPERM: BSD documents that no signal is sent and EPERMreturned when the permission check failed for at least one target process, while POSIX documents EPERMonly when the permission check failed for all target processes.
C library/kernel differencesOn Linux, killpg() is implemented as a library function that makes the call kill(-pgrp, sig).
SEE ALSOgetpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)
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Time: 22:27:45 GMT, June 20, 2016